Engineered for reliability in plumbing and industrial piping, the STZ Industries 4 in. MIP to 3 in. FIP Black Malleable Iron Hex Bushing is a rugged reducer that transitions a 4-inch male pipe thread to a 3-inch female pipe thread with a compact hex body for easy wrench access in tight spaces. Built from durable malleable iron and finished in black, this bushing is designed to withstand real-world use while delivering a secure, leak-resistant connection.
Why this bushing stands out
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Lead-free composition supports safer potable-water installations and aligns with modern compliance expectations.
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Hex body design provides superior grip and torque, making tight installations and re-work simpler even in cramped or elevated spaces.
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Malleable iron construction delivers stronger impact resistance and durability compared to brittle materials, reducing the risk of cracking under pressure or during installation.
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Black finish adds a layer of corrosion resistance and a clean, professional appearance for exposed piping runs.
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Rated for demanding service up to 300 psi and up to 150°F, making it suitable for a variety of water, irrigation, and light industrial applications.
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Bagged packaging helps protect the component during shipping and storage, keeping threads clean for hassle-free installation.
Specifications at a glance
- End 1: 4" MIP (Male Iron Pipe) thread
- End 2: 3" FIP (Female Iron Pipe) thread
- Material: Malleable iron
- Finish: Black
- Maximum pressure: 300 psi
- Maximum temperature: 150°F
- Packaging: Bagged
- Lead content: Lead-free
Ideal use scenarios
- Retrofits where a 4" pipe needs to connect to a 3" fitting or appliance with female threads.
- Residential and commercial plumbing projects requiring a reliable, low-profile reducer in tight spaces such as crawl spaces, basements, or mechanical rooms.
- Irrigation or water-supply lines where a durable, long-lasting connection is essential to prevent leaks and downtime.
- Repairs and maintenance on existing malleable iron piping networks that benefit from a robust, easily gripped hex bushing.
Practical installation tips
- Always clean and dry mating threads before installation to ensure a proper seal.
- Use appropriate thread sealant or PTFE tape on the male threads, and tighten to a firm, leak-free fit without over-torquing.
- Ensure alignment between the 4" MIP side and the 3" FIP side to avoid undue stress on the connections after assembly.
- Store the bagged bushing in a dry location to preserve the finish and thread integrity until use.
With its blend of rugged malleable iron construction, dependable lead-free composition, and a hex-friendly design, this STZ Industries bushing is built to simplify size reductions in demanding piping systems while delivering lasting performance and peace of mind.
